钢渣OGFC-13型排水沥青混合料的配合比设计及性能研究

Design and performance of OGFC-13 steel slag asphalt mixture

以钢渣为粗集料、石灰岩为细集料、矿粉为填料、SBS改性沥青为结合料配制OGFC-13型开级配钢渣排水沥青混合料,其配合比为m（（13.2~19）mm钢渣）∶m（（9.5~13.2）mm钢渣）∶m（（4.75~9.5）mm钢渣）∶m（（0~4.75）mm石灰岩）∶m（矿粉）=13∶28∶45∶13∶1,最佳油石比为4.5%,聚脂纤维用量为0.3%。该沥青混合料的钢渣用量高达86%,且不用提高改性沥青和纤维用量,有利于钢渣的综合利用,节约道路建设成本。通过马歇尔稳定度、冻融劈裂强度和车辙试验得出,该沥青混合料的马歇尔稳定度为9.8kN,劈裂强度比为89.8%,动稳定度为5753次/mm,均优于技术规范要求。该沥青混合料的渗水系数为37.0mL/s,摩擦系数（BPN值）为70.7,表明其渗水能力很强,抗滑性能优良。

OGFC-13 open-graded steel slag porous asphalt mixture was produced from the SBS modified asphalt, with steel slag as coarse aggregate, limestone as fine aggregate, and mineral powder as pad- ding. The mix proportion was （19-13.2）mm steel slag： （13.2-9.5）mm steel slag ： （9.5-4.75） mm steel slag ： （4.75-0）mm limestone ： mineral powder=13 % ： 28%： 45% ： 13% ： 1%. The op- timal asphalt content （OAC） was 4.5%, and the consumption of polyester fiber was 0.3%. Steel slag consumed reached 86% with no increase in needed asphalt and polyester fiber, which reduced the cost. It is found that the Marshall stability of OGFC-13 reaches 9. 8 kN, the freeze-thraw split strength ratio 89.8% and the dynamic stability 5753 times/mm, which are all superior to those stipulated in China＇s relevant regulations. The water permeability coefficient of OGFC-13 is 37.0 mL/s and the friction coefficient 70.7, which means that OGFC-13 has a strong water seepage and anti-slid- ing performance .